<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <el-card>
      <el-alert show-icon title="注意：只允许为第三级分类设置相关参数" type="warning" :closable="false"></el-alert>
    
      <!-- 选择商品分类区域 -->
      <el-row class="cat-opt">
        <el-col>
          <span>选择商品分类</span>

          <!-- 选择级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="catelist"
            :props="{ expandTrigger: 'hover', value: 'cat_id',label: 'cat_name', children: 'children'}"
            @change="handleChange"></el-cascader>
        </el-col>
      </el-row>

      <!-- tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals" 
                        :key="i" 
                        closable
                        @close="handleDelete(i, scope.row)"
                >{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input class="input-new-tag"
                        v-if="scope.row.inputVisible"
                        v-model="scope.row.inputValue"
                        ref="saveTagInput"
                        size="samll"
                        @keyup.enter.native="handleInputConfirm(scope.row)"
                        @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button 
                        v-else 
                        class="button-new-tag"
                        size="small"
                        @click="showInput(scope.row)"
                        >
                        + New Tag
                </el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals" 
                        :key="i" 
                        closable
                        @close="handleDelete(i, scope.row)"
                >{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input class="input-new-tag"
                        v-if="scope.row.inputVisible"
                        v-model="scope.row.inputValue"
                        ref="saveTagInput"
                        size="samll"
                        @keyup.enter.native="handleInputConfirm(scope.row)"
                        @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button 
                        v-else 
                        class="button-new-tag"
                        size="small"
                        @click="showInput(scope.row)"
                        >
                        + New Tag
                </el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      :before-close="handleClose">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" class="demo-ruleForm">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      :before-close="editDialogClosed">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px" class="demo-ruleForm">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      catelist: [],
      cateProps: {
        value: 'cat_id',
        label: 'cat_name', 
        children: 'children'
      },
      selectedCateKeys: [],
      activeName: 'many',
      manyTableData: [],
      onlyTableData: [],
      addDialogVisible: false,
      addForm: {
        attr_name: ''
      },
      addFormRules: {
        attr_name: [{
          required: true, message:'请输入参数名称',trigger: 'blur'
        }]
      },
      editDialogVisible: false,
      // 修改表单数据对象
      editForm: {
        attr_name: ''
      },
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          {required: true, message:'请输入参数', trigger: 'blur'}
        ]
      },

    }
  },
  created() {
    this._getCateList()
  },
  methods: {
    async _getCateList() {
      const {data: res} = await this.$http.get('/categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类列表失败')
      }
      

      this.catelist = res.data
      console.log(this.catelist)
    },
    handleChange() {
      this._getParamsData()
    },
    async _getParamsData() {
      console.log(this.selectedCateKeys);
      if (this.selectedCateKeys.length !==3 ) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      console.log(this.selectedCateKeys);
      const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
          params: {
              sel: this.activeName
          }
      })

      if(res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败！')
      }

      res.data.forEach(item => {
        item.attr_vals = item.attr_vals? item.attr_vals.split(' ') : []
        // 控制按钮与文本框的切换显示
        item.inputVisible = false,
        // 文本框中输入的内容
        item.inputValue = ''
      })

      console.log(res.data);
      if(this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    handleTabClick() {
      console.log(this.activeName);
      this._getParamsData()
    },
    handleClose() {
      this.$refs.addFormRef.resetFields()
    },
    async showEditDialog(attr_id) {
      const {data:res} = await this.$http.get(`/categories/${this.cateId}/attributes/${attr_id}`, {
        params: {
          attr_sel:this.activeName
        }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败！')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
      this.editDialogVisible = false
    },
    addParams() {
      this.$refs.addFormRef.validate(async valid => 
      {
          if(!valid) return
          const {data:res} = await this.$http.post(`/categories/${this.cateId}/attributes`, {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          })

          if (res.meta.status !== 201) {
            return this.$message.error('添加参数失败')
          }
          this.$message.success('添加参数成功')
          this.addDialogVisible = false
          this._getParamsData()
        }
      )
    },
    // 点击按钮修改参数
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const {data: res} = await this.$http.put(`/categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败！')
        }
        this.$message.success('参数修改成功！')
        this._getParamsData()
        this.editDialogVisible = false
      })      
    },
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm(
        '此操作将永久删除参数，是否继续？',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)

      // 用户取消了删除的操作
      if (confirmResult !== 'confirm') {
        return this.$message.info('已经取消删除！')
      }

      // 删除的业务逻辑
      const {data:res} = await this.$http.delete(`/categories/${this.cateId}/attributes/${attr_id}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败！')
      }
      this.$message.success('删除参数成功')
      this._getParamsData()
    },

    showInput(row) {
      row.inputVisible = true
      // $nextTick方法的作用是当页面上的元素被重新渲染之后，才会指定回调函数中的代码
      //  this.$nextTick(_ => {
      //  this.$refs.saveTagInput.$refs.input.focus()
      //  })
    },
    // 文本框失去焦点，或按下Enter都会触发
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 需要发起请求，保存这次操作
      const {data:res} = await
      this.$http.put(`/categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })

      if(res.meta.status !== 200) {
        return this.$message.error('修改参数项失败')
      }

      this.$message.success('修改参数成功')
    },

    handleDelete(i, row) {
      row.attr_vals.splice(i, 1)

      this.saveAttrVals(row)
    },
    async saveAttrVals(row) {
      // 需要发起请求，保存这次操作
      const {data:res} = await
      this.$http.put(`/categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })

      if(res.meta.status !== 200) {
        return this.$message.error('修改参数项失败')
      }

      this.$message.success('修改参数成功')
    }
  },
  computed: {
    isBtnDisabled() {
      if(this.selectedCateKeys.length !==3 ) {
        return true
      }
      return false
    },
    cateId() {
      if (this.selectedCateKeys.length ===3 ) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  },
  components: {
    
  }
}
</script>

<style lang="less" scoped>
  .el-tag{
    margin: 5px;
  }

  .input-new-tag{
    width: 120px;
    line-height: 10px;
  }
</style>